King David immediately repented his sin after the prophet Nathan showed him his error. Nevertheless, God could not overlook David's sin and punished David by causing adversity against him from his own house by taking away his wives and killing his son. 2 Samuel 12:1-15

How is this argument germane? Are you defending the alleged "Calvin sanctioning the burning of Servetus" by referring to David's sin, as somehow justifiable?

If so, please provide the logic, for I do not see it at all and therefore cannot point out any other errors I may find in it.